Hydraulic roller cam

[meeds67]

From surfing the Tech Forum it seems that a Hyd. roller cam assembly is a definate H.P. booster. Could 1 or more knowledgable persons offer advice on a Hyd. roller cam for a 67 400 c.i. motor I'm building. I want a strong street motor that will run on pump premium gas. I'm also open to suggestions for carb,intake,compression,headers, since I have not bought any of the above. How much extra H.P. will be generated by a roller? Do they come with matched pushrods and rockers? If not please comment on these choices as well. Are there any negatives to a roller cam? How would a roller stack up against a SPC3 #744 cam? Mike

[meeds67]

From surfing the Tech Forum it seems that a Hyd. roller cam assembly is a definate H.P. booster. Could 1 or more knowledgable persons offer advice on a Hyd. roller cam for a 67 400 c.i. motor I'm building. I want a strong street motor that will run on pump premium gas. I'm also open to suggestions for carb,intake,compression,headers, since I have not bought any of the above. How much extra H.P. will be generated by a roller? Do they come with matched pushrods and rockers? If not please comment on these choices as well. Are there any negatives to a roller cam? How would a roller stack up against a SPC3 #744 cam? Mike

[meeds67]

Sorry I ran out of room to finish the original posting. Car is 67 GTO 4spd.,355 posi,670 heads,noA/C,P/S&P/B. Thanks Mike

[herdsman]

Mike, check out the post in the lobby"406ci 9.50cr" it has a Comp Cams Hyd. roller cam in it. The engine is a 74 400 bored .030= 406ci, KRE ported 670 heads. If you would like more information on the rest of the combination just let me know. Tom

[meeds67]

Tom, WOW. I'm fully impressed by your numbers. I would truely like to know all the particulars of the motor that you are willing to share from carb to crank. Thanks,Mike

[herdsman]

Mike, When I get home from work tonight I will post all of the information on the engine. Hopefully I can post the head flow sheet and the dyno sheet also. Amy brought home a new HP printer last night and I spent most of the night playing with it and the digital camera :cool: I guess I have to take a photo of the sheet and down load it to the computor??? :confused: Tom

[ February 28, 2002: Message edited by: herdsman ]

[ February 28, 2002: Message edited by: herdsman ]</p>

[Bud Lyons]

Tom, What did you play with? Amy or the printer? /infopop/emoticons/icon_wink.gif

[herdsman]

Bud, I am sorry to say it was not Amy(it was past her bed time on a work night, she opens the unit at the hospital at 6:00am)
Mike, I have the flow sheet and the dyno sheet on the computor but I do not know how to post. So I will just type it in...
Block= 1974 Gran Prix 235hp 400 + .030,cam and crank journals line honed for straightness
Heads= 1967 428 670, 75cc, ported by Mark at KRE they flow: Intake- 257 @ .500 and .600 inch of lift, the Exhaust- 218 @ .500 and 219 @ .600 lift,the exhaust crossovers filled with aluminum, Comp Cams 995 springs, Ferrea stainless steel valves
Intake= Old Torker I worked inside to match the flow of the heads by Jeff at KRE
Carb= Box stock Speed Demon 750cfm,jets adjusted for the best Hp & Torque jet size 76p,92s, fuel pressure set at 6lbs
Distributor= Used Mallory unilite purchased on this board,22degrees of timing in dist. total timing of 38.5 in by 2,400rpm
Rocker arms= Comp Cams Magnum 1.52 roller tip
Cam= Comp Cams XR288HR-10 hydraulic roller specs=
236/242 @ .050 with .520/.540 lift 110c/l installed @ 106 intake, lifters set at 1/2 turn past"0"
Timing chain= Comp Cams roller
Crank= stock cast polished, de-burred, rotating assembly balanced to <.5 gram
Rods= Crower Sporstman
Pistons= TRW/Speedpro forged
Headers= 1 3/4" Headman for 65 GTO
sorry about it being a long post
/infopop/emoticons/icon_frown.gif If I left any thing out let me know. I hope this is helpful with your engine build. Tom

[herdsman]

Mike, sorry I did not answer your question about pushrods, no you do not get pushrods or rocker arms when you buy a roller cam. I made a pushrod length checker. I took a stock pushrod and cut 1" out the middle then taped the inside of both ends 1/4-20 and used 2" long piece of all thread. I ended up with 8.800 long Comp Cam custom Chrome-moly 5/16. Tom

[Robert Williams]

Mike,--click on this site for some good reading on Hyd Roller Cams.---------------------------- http://www.idavette.net/hib/camcon.htm