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Just curious about this one. My buddy had a 420, 23* modified engine built and he told me his engine builder said it had right at 700 HP. I was thinking that is a little to much for the heads being they are the brodix track 1x. Let me know what you guys think or know from experience. Thanks in advance.
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What engine block? Stock GM block will come apart with anything over 650hp and it may do it at 650.Originally posted by racer11 View Post -
Sounds like the builder has the correction factor on his dyno jacked up.Comment
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It is in a dart litlle m block. I was thinking the same thing about the dyno but wasnt for sure. Keep the thoughts coming. Thanks for the input.Comment
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nascrap makes 850hp with a 358... im sure it would not be out of the question to get that with a 415+", you could throw money at it til it made the power numbers that you are talking, but is it driveable ? too much carb and too much cam will make power on the dyno but might suck at the trackComment
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A good head guy can get some impressive numbers from the old Track I's.
If its just the big numbers you are looking for, a better set of heads would produce more but for your average guy on a short track the Track I's will work well.
Just built a 421 SHP block, 14.5-1 , 260'ish custom roller with some worked Track I's on it. Very driveable and 680hp @7,600 rpm on gas. An easy build.Comment
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No way to compair RO7 engines to a 23 degree motor, and it is more towards 900hp with 358.Originally posted by bushracing67 View PostComment
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Nascar was making 740hp on a 358 with 18 degree heads 15-20 years ago and IMCA lates model are making over 600 hp with restricted track 1 heads/intake manifold on a 361 cubic inch rule, with 10.5:1 compression.
If those heads have any porting or have been cnc'd and with the proper intake, custom grind cam, etc. on a 420....sounds pretty reasonable to me.JD's Performance
13034 Hwy 99
Wapello, IA 52653
319-931-0677Comment
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