DeTomaso Mailing List: October 97, Message #240
     



From: 	GRR456@aol.com

Subject: Re: I'm back -Reply

Date: 	Fri, 10 Oct 1997 11:41:25 +0000



Dan,



Well...I had a stock '74 with 8:1 compression and put a General Kinetics (292

adv dur, .510 lift, I think) mech cam, did the conversion with the rocker

studs, put a little larger intake valves (actually from a BB chev)...Did

about 3 hours of grinding out the area behind the valves, and unshrouding the

intake valves....and just giving the heads a good 4 angle valve job, on a

Serdi head machine..I think I made about 410 HP on the dyno, with a 750

holley double pumper and about 390 with a Holley 3310 - 780 vac

secondaries....I think the RPM's maxed out at about 6000, or so...Now, I

didn't do anything with the lower end of this engine, so it was a stock

bore\stroke smogged '74.



I've actually forgotten what the ratio was with the roller rockers, but for

some reason I thought that the Chev's had more ratio. I had used the Crower

roller Rockers. The price has come down for the Ford stuff, anyway. Another

reason I went with the Chev rocker's is that I could use the Chev 7/16 screw

in rocker studs at about $40 for the set....It all worked out very

well....One other thing was...When I sold the car, I kept the roller rockers,

and put on a set of stock stamped Chev long slot B\B rockers, that we had in

stock. They worked very well, also.



It wasn't very hard to adjust the rockers either...Probably less than an

hour. You don't adjust them with the engine running...You adjust the Intake

when the exhaust is starting to close, and the exhaust when the intake is

starting to open....



I like roller cams...you can get that short duration\high lift...That really

brings your engine alive at the lower RPM's..Lot's of torque...Something like

250 degrees @.050 with about .600 lift...And that cam will idle great, but

sound really cool....



As far as the 1 3/4 header's...I wouldn't go any more than that....That's

what we use on our stock cars, with a step up to 1 7/8, about 6" from the

flange.  We use a 1 7/8 header on the sprint car stuff...The 1 3/4 headers

work fine on our Aluminum C302 heads, but I don't know how it will work on

the 4v heads....



Regards.............Gary