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T O P I C    R E V I E W
jd63 Posted - 30 Jul 2017 : 11:35:48 AM
Hi I have a 1970 360hp 455 yh block with 15 heads I'm going to put it in a 81 trans am what do I need to do to it to make it into a good runner. is there a better cam and are the heads a good pair and any upgrades to the bottom end that can be done. the car will have a auto over drive and 342 or 373 gears Thanks
12   L A T E S T    R E P L I E S    (Newest First)
Phil Posted - 10 Aug 2017 : 8:53:39 PM
The OP mentioned running an OD Trans so the rear gear highway RPM's won't be an issue. Probably taller tires on that Bonne as well vs. what most of us are used to running so that'll complement the shorter gears too.
cortcomp Posted - 03 Aug 2017 : 10:23:04 AM
That's how my 455/XE284 was B&P. I'd get 2ish good pumps then hard. The hidden audi vac pump and can was a cheap and fun project that made it stop a LOT better, and gave me lots of confidence back. The pump ran until the can/system hit 19 inches. So if you were driving it would kick on and off but you wouldn't really hear it. If the car was off and you turned the key on it sounded like an electric fuel pump.
Blued and Painted Posted - 03 Aug 2017 : 10:12:28 AM
Im running around 11 inches of vac. It stops good but i must conserve vacuum. No extra pumping of the pedal or the pedal gets hard, the eyes get wide, and the but cheeks tighten up.
Hikin Mike Posted - 02 Aug 2017 : 4:07:32 PM
quote:
Originally posted by Bill Boyle

Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill



Just curious. How much vacuum does your 400 pull?
Hikin Mike Posted - 02 Aug 2017 : 3:54:56 PM
quote:
Originally posted by cortcomp

10" and no power brake issues? That's great! I usually hear about issues when people are under like that 13-15 mark.



Unless the gauge is wrong or I'm just used to how my brakes work after 25+ years of driving it...lol!
cortcomp Posted - 02 Aug 2017 : 2:44:02 PM
10" and no power brake issues? That's great! I usually hear about issues when people are under like that 13-15 mark.
Hikin Mike Posted - 02 Aug 2017 : 2:18:22 PM
quote:
Originally posted by Bill Boyle

Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill



It pulls 10" at idle. No issues with my power brakes. Here's a video if you're interested: https://youtu.be/5hbCBFuqVhs

I've been using it since 1995-ish. Never had a chance to take it to the track. With technology as it is now, I've been wondering if I need to look for another cam. But since I'm on a fixed income and I'm happy with how it sounds/runs, I doubt I'll be changing it any time soon.
Bill Boyle Posted - 31 Jul 2017 : 07:50:44 AM
Mike--how does that cam handle things in the 455+ block? What kind of vacuum do you see at idle?

Bill
Hikin Mike Posted - 30 Jul 2017 : 10:16:16 PM
quote:
Originally posted by Bill Boyle

The sky is the limit with a big budget. $$$ How much do you have to spend? What are your plans for the car in terms of use? Do you want a 14 second car? A 13 second car? 12? 11 or quicker? Let us know.



I noticed your running the same cam I'm using, but I've got a 455.
Hikin Mike Posted - 30 Jul 2017 : 10:11:27 PM
I have that block in my car. I'm using different heads (6S-7) though. You may want to think about using a 3:70 gear. I ran that for a while and it was fine at the track, but in the highway, not so much. I switched to a 3.00 (I have a Ford 9") and I can cruise on the highway around 2500 rpm. A recent trip to Yosemite I saw about 16 MPG.
jd63 Posted - 30 Jul 2017 : 3:18:54 PM
I just want a nice cruiser that's quick when it needs to be and has some gas mileage so a guy can afford to drive to a movie or car show. I don't need to win every race
Bill Boyle Posted - 30 Jul 2017 : 1:39:12 PM
The sky is the limit with a big budget. $$$ How much do you have to spend? What are your plans for the car in terms of use? Do you want a 14 second car? A 13 second car? 12? 11 or quicker? Let us know.

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