Guess the horsepower

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flipper

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Bought this , won't be able to run it til next summer , take a guess at horsepower just for fun
340 bored .020" over
10.5:1 speed pro hyperutectic pistons
Racer brown solid cam, .520 lift, can't remember duration but it's a lot
360 j heads fitted with 2.02/1.60 valves, ported and flow tested (255 from on intake)
Titanium retainers
Victor jr intake
273 rockers (adjustable)
Windage tray
I think the crank is turned .020" on both mains and rods
 
Depends on the exhaust side and quality of the machining and assembly you should be in the 425-450 range at the crank. That would be my estimate.
 
flipper said:
Bought this , won't be able to run it til next summer , take a guess at horsepower just for fun
340 bored .020" over
10.5:1 speed pro hyperutectic pistons
Racer brown solid cam, .520 lift, can't remember duration but it's a lot
360 j heads fitted with 2.02/1.60 valves, ported and flow tested (255 from on intake)
Titanium retainers
Victor jr intake
273 rockers (adjustable)
Windage tray
I think the crank is turned .020" on both mains and rods
Click to expand...
Hooker hedders and an undecided holley
 
My butt dyno is dead accurate. at least within 2 mph. I like to put a 100 dollar bill on the dash to measure torque.
 
My best guestimation would be about 425-450hp up somewhere over 6500rpm IF that is an actual 10.5:1 compression engine and not just some 10.5:1 compression pistons in a block with not so bluprinted deckheights and heads with+70cc chambers.
 
Take it to the track and run it time slips don't lie..guesstimates are just that nothing but guesses..
 
stroked340 said:
Take it to the track and run it time slips don't lie..guesstimates are just that nothing but guesses..
Click to expand...
I agree, but you can still do a fairly usefull guesstimate based on headflow,camduration/lift,compression and a few choices of parts.
How well the whole combo is going to work is a different question all together and if the specs are actualy correct.
For what its worth the only racerbrown solid cam i found spec for that was .520lift was somewhere around [email protected]
 
It depends on how capable you are at tuning it....

If you can't tune for ****, it won't run for ****....
 
Maybe 125 horse power if your lucky. Just sell it to me now and cut your losses. :)
 
Last edited:
flipper said:
Bought this , won't be able to run it til next summer , take a guess at horsepower just for fun
340 bored .020" over
10.5:1 speed pro hyperutectic pistons
Racer brown solid cam, .520 lift, can't remember duration but it's a lot
360 j heads fitted with 2.02/1.60 valves, ported and flow tested (255 from on intake)
Titanium retainers
Victor jr intake
273 rockers (adjustable)
Windage tray
I think the crank is turned .020" on both mains and rods
Click to expand...
Should be right around 405 HP. I had 360 similar build 405at crank.
 
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