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#31
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Now back to these 430 ZL1's. Like I said, I don't see a 430 cresting 700Hp back in the early 70's?
Grumpy's '68 BEST pass for the 1970 season according to Draglist times was 9.845 and @ 3010 IF he was only 430 inches would have been 623Hp. YET most go by MPH when looking at Hp at the track. The BEST that car went in 1970 was 138.03 and @ 3010 would have been 609.9Hp. Now the thing is, It doesn't look from all accounts the Grumpy ran the CA 430 ZL1? I not only have the magazine from July of 1970 where Grumpy built the 70 with a GM 430 inch RAT motor. So the size isn't in dispute, BUT it does say he used the GM 427 crank. Therefore he would have the normal "052" 4.250 block ZL1 as the engine wouldn't have been 430 with the 3.75 stroke crank and 4.440 bore, more like 465 inch. There is also mentioned out there that for match racing, Grumpy would use a mountain motor and take ALL the weight out of the car. The stories I've heard was a 4.44 block and 4" 454 crank for the old 495 inch but the weight was out, so who know what that motor would have made. I seem to doubt that even Grumpy's 495 IN 1970 made 700Hp? His best match race time was 9.40's but was there 100lbs out or 200 lbs out. It wasn't 3010 legal weight to make the 700Hp.
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'58 Apache pick up '78 Z28 4sp being restored '70 W30 convert TRIBUTE '78 Z28 32,000 survivor, Og Yellow paint, AC. '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW) |
#32
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#33
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from what I read Bill Jenkins ran a few different engines in 1970 and 1971
the articles are not always accurate so its hard to say what the engine and HP was but I have read that the 1970 and 1971 Pro Stock cars (Ford Chevy Chrysler) were over 700hp In Super Stock and MP Bill ran the ZL1 and L88 and L72 In Pro Stock he ran the CanAm 430 engine in match racing he ran the CanAm 494 here is a screen shot from Drag List 1971 PS Mountain (match race) Can Am 494 where Bill ran 9.265 at 141 mph says the 1971 record was 9.265 at 149.76 mph John Greenwood ran the ZL1 in his Corvettes for SCCA and FIA road racing here is a quote about the #49 Corvette where they claim the Traco ZL1 was 750HP "When it was originally converted, the #49 BFG Corvette received all the popular Greenwood innovations: adjustable suspension, above, notched rear arms, rapid replacement radiator, and quick camber adjustments. A blueprinted Chevrolet ZL1 all-aluminum 427-cubic-inch engine, producing over 750 horsepower at 6,500 rpm, was chosen to replace the factory L88. During the restoration process, the #49 car was fitted with a potent Traco 427 ZL1 Driven by John Greenwood, above, right, 1973, Bridgehampton, Dick Smothers, Bob Johnson and Don Yenko, the #49 Corvette ran in 12 & 24-hour enduro races at Daytona, Le Mans and Sebring. At Le Mans, the Traco-engined “show” Stingray was clocked at 215 mph!" |
#34
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4-30-20 day for the 430 CanAm aluminum big block Chevy
That picture shown is of the replacement 430 cu. in. 360hp Buick engine built for 1967-1969 Buicks before going to 455 Cu. in. Buick engine of the same design. It was a totally different design departure from the earlier Nail Head Buick engines.The Last year for a Nail Head Buick was 1966 at 401 cu. in. However, your statement that Buick engines had torque in spades is quite true.
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#35
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4-30-20 day for the 430 CanAm aluminum big block Chevy
Quote:
Last edited by Flying Undertaker; 05-07-2020 at 11:23 PM. Reason: addition at bottom |
The Following 2 Users Say Thank You to Flying Undertaker For This Useful Post: | ||
Arrowsmith (05-08-2020), EZ Nova (05-08-2020) |
#36
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I looked at my ZL1 dyno sheet, @ 6700 I was at 785.1 Hp but it should have been higher. And you "probably" left 50 or so Hp on the table with you deal using the GM piston design and not pulling to 73/7500 range. Modern piston with 1/16 rings or better rings and not the 5/16 would have picked it up nicely too. THEN one can look at the heads/valves and see what "could" be found there? I don't know what you did with your stuff, like better modern valve, back cut and valve job, but there is POWER there too.
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'58 Apache pick up '78 Z28 4sp being restored '70 W30 convert TRIBUTE '78 Z28 32,000 survivor, Og Yellow paint, AC. '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW) |
#37
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I have found that the dyno has a lot to do with peak numbers. I took my 427 to Dale Mears Racing and used his dyno. It would have shown another 75 HP if I had taken it to Tommy's Auto Machine and another 100 HP if I had taken it to the dyno in Evansville. Apparently there is another dyno close that would have shown about 150 more.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#38
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4-30-20 day for the 430 CanAm aluminum big block Chevy
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headwork, pocket porting, etc., a bigger cam and a holley dominator! Don. |
#39
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4-30-20 day for the 430 CanAm aluminum big block Chevy
Quote:
Last edited by Flying Undertaker; 05-08-2020 at 11:24 PM. Reason: Valve size |
The Following 2 Users Say Thank You to Flying Undertaker For This Useful Post: | ||
big gear head (05-09-2020), RobR (05-09-2020) |
#40
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Undertaker, funny you were mentioning ProStock! My crew chief has been involved in PS since the late 80's and there team since 1991. I also own a 498, 4.84 Borespace Pontiac 427 headed EX ProStock motor. I have personally had my hands on 3 old chevy PS engine from that era, 1 AMC and a couple of the Ford Clevends from 75 or before. Umm never a Hemi???
Anyway the shop I'm associated with built my PS 498 with 1 or 2 other back in the 90's. So we put a lot of that tech into this ZL1. You wouldn't know it with the valvecovers on and intake on. I have seen 2.25 valve in those old motors but never really paid much attention to see IF the 2.300 would fit??? My "074" were originally done by AFR as a PS head I located off the old serial #. These were 2.25 valved. Now we did some more work to them to get them to work as good as they do. I can post some pictures if you would like to see these.
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'58 Apache pick up '78 Z28 4sp being restored '70 W30 convert TRIBUTE '78 Z28 32,000 survivor, Og Yellow paint, AC. '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW) |
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