James Clews
Well-Known Member
What sticks out to me is using that cast crank! I broke my cast crank in my 410 with about 355 rwhp!
I have only used a chassis dyno on my 1974 aussie Valiant charger but current specs are roller hyd cam with 236/242 @ 50 with 610 lift on a 112 lobe sep , 11.5 comp with trick flow heads used just out of the box, 5 speed tko box with 3.91 gears With old heads made 392rwhp and ran 11.4 qtrs @119mph. Now makes 425 rwhp So probably About 530 or 540 @ the flywheel and revs cleanly to 6500rpm. Idles at 800 rpm with only a slight lope and has 15 inches of vacuum when fully warmed up.
You do not need a bigger cam just more head flow! The trick flows are a great addition and work well just out of the box. I have not raced it with the new combination but expect it to now run low elevens but that cam is really smooth and does not jump around when coming down low especially with a manual transmission.
I am now 70 years young and do not like a pig to drive but hate autos and my car drives great but when you step on the gas at about 2 grand in second gear it just goes insane with wheelspin @ 6500rpm!
The low revving could also be the rocker arm instability, but the trick flows have also a raised rocker shaft location and Mike @ B3 also sells a relocation kit and it definitely helps in valve train stability.
By the way I noticed everybody was saying you need bigger headers?
In Australia we are limited on header choices because of our R/H drive and steering box location but I run a pacemaker header being a try y header 1 3/4 into 2 inch into 3inch with dual 3 inch exhaust system and works quite well.
I have only used a chassis dyno on my 1974 aussie Valiant charger but current specs are roller hyd cam with 236/242 @ 50 with 610 lift on a 112 lobe sep , 11.5 comp with trick flow heads used just out of the box, 5 speed tko box with 3.91 gears With old heads made 392rwhp and ran 11.4 qtrs @119mph. Now makes 425 rwhp So probably About 530 or 540 @ the flywheel and revs cleanly to 6500rpm. Idles at 800 rpm with only a slight lope and has 15 inches of vacuum when fully warmed up.
You do not need a bigger cam just more head flow! The trick flows are a great addition and work well just out of the box. I have not raced it with the new combination but expect it to now run low elevens but that cam is really smooth and does not jump around when coming down low especially with a manual transmission.
I am now 70 years young and do not like a pig to drive but hate autos and my car drives great but when you step on the gas at about 2 grand in second gear it just goes insane with wheelspin @ 6500rpm!
The low revving could also be the rocker arm instability, but the trick flows have also a raised rocker shaft location and Mike @ B3 also sells a relocation kit and it definitely helps in valve train stability.
By the way I noticed everybody was saying you need bigger headers?
In Australia we are limited on header choices because of our R/H drive and steering box location but I run a pacemaker header being a try y header 1 3/4 into 2 inch into 3inch with dual 3 inch exhaust system and works quite well.
