350 buildup
Thread Starter
Teching In
Joined: Nov 2011
Posts: 14
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From: New Richmond
350 buildup Hi all i recently pulled the motor from my 84 monte to install some aluminum heads. anyways i put them on there 210cc intake runners, 2.02 valve. exhaust 70cc port 1.60 valve. 58cc chambers. the engine had a comp cam installed about 3 years ago it was .480 .480 lift. 110deg lsa 231 231 dur @0.50 . has a eledbrock performer intake and 750 holley street hp carb. brought it to the engine dyno and it made only 327hp @ 4700 and 397 tq @3800. not impressed i think the cam is not right for the setup so i called bullet cams and they ground me a cam Intake .507 lift and ex.530 239 247 dur and 107 lsa. they ground the cam with 4deg advance in it . also they recommend i installed 1.6 rockers in the intake so that gives me .541 lift in intake and 240 dur. its a 350 .040 over and compression is 10.4-1 with my pistions. im going back to the dyno this wed any ideas on how much this cam will help???
Thread Starter
Teching In
Joined: Nov 2011
Posts: 14
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From: New Richmond
the previous setup was the comp cam listed below cast heads 76cc chambers 160 cc intake with 1.94 and 60cc ex with 1.60 flat tops and performer intake and 625 eledbrock carb with a 700R4 2500 stall and 3.73 gears. car ran 13.33 best time. Now i built up a 2004R with a 10in 2800-3000 stall. along with new engine combo
Teching In
Joined: Aug 2011
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camshaft I would think you'd be somewhere around 300-350 HP with previous setup. Was intake port matched. The 750 HP holley was a good move, but the current setup should be around 400-425hp with the heads, cam, intake and carb. IMO I would upgrade to a performer airgap and port match to the heads. I would also try a 1" 4-hole phenolic carb spacer. I would need more specific component specs. Like on the heads, what brand, were they pocket ported, ect? Do heads have heat crossovers and if so did you block them? Head gasket compressed thickness? Piston-head clearence?(quench). Just be a lot more specific. I wouldn't have went to a 200-4R from a 700R4. The 700R4 is far mpre superior. I've been a transmission builder, owner/operator over 20 years and sponsored over 10 drag racers. Hopefully I can help. Thanks, ttyl, james
Teching In
Joined: Mar 2020
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I would think you'd be somewhere around 300-350 HP with previous setup. Was intake port matched. The 750 HP holley was a good move, but the current setup should be around 400-425hp with the heads, cam, intake and carb. IMO I would upgrade to a performer airgap and port match to the heads. I would also try a 1" 4-hole phenolic carb spacer. I would need more specific component specs. Like on the heads, what brand, were they pocket ported, ect? Do heads have heat crossovers and if so did you block them? Head gasket compressed thickness? Piston-head clearence?(quench). Just be a lot more specific. I wouldn't have went to a 200-4R from a 700R4. The 700R4 is far mpre superior. I've been a transmission builder, owner/operator over 20 years and sponsored over 10 drag racers. Hopefully I can help. Thanks, ttyl, james
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 332
From: Wilmington, De
Having done a 200-4r for my El Camino, I can say that if I had to do it over again, I would go with the 700r4 or a 4L60e with a standalone controller. The parts availability for the 200-4r isn't nearly as extensive as the 700 is since the 700 shares a lot of components with the 4l60. The shift points in the 700 are also much more tunable than they are in the 200. With the 200, adjusting shift points means you are dropping the pan to change the governor/valve body, whereas the 700 allows you change weights and springs without taking a fluid bath. Torque converter selection is also limited due to the 200's 27 spline input shaft. Most options are for the 30 spline inputs on the later 700s/4L60s.
The 200 can certainly be made plenty strong, but it requires billet internals to withstand abuse, and you could purchase billet internals for the 700 and achieve the same thing. The biggest advantage to the 200-4r is that it is more compact in size than the 700, and will bolt in place of a TH350, using the same mounts and driveshaft. The 700 will require a different mount, shorter driveshaft, and in some instances, floorpan modification. The 200's size is the main reason I selected it over the 700.
