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Rholmes · 12-24-2001, 07:01 PM

Looking for some helpful advice on my combo.The engine is a 1971 455,stock rods,forged pistons bored .030,tripower(65 model) with stock unported 6x-4 heads.The engine will be mostly for daily driving with an occ. trip to the strip with 3.08 gears and a 400 trans.I would like to try one of either Crane's or Comp's hydraulic rollers but have heard they may be over kill since these heads are unported and my tripower do not flow enough cfm's.Any advice would be appreciated.

Rholmes · 12-24-2001, 07:01 PM

Looking for some helpful advice on my combo.The engine is a 1971 455,stock rods,forged pistons bored .030,tripower(65 model) with stock unported 6x-4 heads.The engine will be mostly for daily driving with an occ. trip to the strip with 3.08 gears and a 400 trans.I would like to try one of either Crane's or Comp's hydraulic rollers but have heard they may be over kill since these heads are unported and my tripower do not flow enough cfm's.Any advice would be appreciated.

Goatman · 12-24-2001, 07:15 PM

Stick with a stock cam, possibly a RAIII or RAIV grind. Anymore cam than that will be overkill.

Rholmes · 12-24-2001, 07:43 PM

Thanks Goatman I had considered the RA1V cam since I have one in the garage(Crane's blueprinted).Can roller hydraulic lifters be use with this cam or is the cam's profile incompatible?As you can see I'm trying to get the most out of this combo.I have used Rhodes lifters in the past but wanted to try something a little different

Blackcat · 12-24-2001, 07:57 PM

My advice is to go with a HO cam. Don't go with anything bigger than the Ram 3 cam. Otherwise you are waisting your time.
With the 308 gears anything else for a cam will waste the 455's true potentual of low end and mid range power that the 455 is known for! You build one with a ram 4 cam and I'll spank you with an HO with the same combo easily!

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So, Blacky, what's your biggest turn on? Is it that Big Blue Ball that the Tiger is holding? Rash

Rholmes · 12-24-2001, 08:20 PM

B/C even with the HO cam(RAIII) can performance be picked up with the hydraulic roller lifters? Or is the cam's profile incompatible.May help at also reducing engine's heat,huh?

tom s · 12-24-2001, 08:38 PM

roller lifters will only work on a roller cam

Blackcat · 12-24-2001, 08:38 PM

It may but the factory cams are not designed for rollers.
If you want more use 1:52 roller tip rockers or 1:50 full rollers and upgrade to 7/16 studs and an adjustable valve train.
Unless you are going full out racing please forget the exotic roller stuff! Using pratical stuff will get you there. Your Rear gears limit your potential. I used to have a 63 grand prix with a used 455 and a 65 Tripower. Th400 and 3:08 gears. It was a great terror on the street and ran deadly consistant 15 flat in the quarter mile. This was a bone stock motor in a huge heavy car.
with an open rear end.

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So, Blacky, what's your biggest turn on? Is it that Big Blue Ball that the Tiger is holding? Rash

Rholmes · 12-24-2001, 09:04 PM

B/C,15's quarters?What a dog.Maybe I need to rethink the 308?I guess I'll have to step up to either 355's or 373's.This engine will be in a 65 GTO.I also own a 74 GTO that runs 7.3's 1/8 mile with a 4 speed(m-22) and 373 gears.Although the 74 is a 9.5 c/r pump gas engine I'm trying to build another that's less dependent on the crude.I know,I know can't have cake and eat it too.The heads already has 7/16 screw-ins.Maybe I'll have to spring for some port work after x-mas.Thanks for the advice.

Philcol · 12-24-2001, 09:04 PM

If this were a 400 4 barrel would the RAIV (041) cam be a safe bet because of torque range difference?

Phil

Blackcat · 12-24-2001, 09:24 PM

Actually, it was very respectable for a 5,000lb car with a used engine form a junkyard with a standard 4bbl cam.
Listing the car and the combo would help tremendously! I recomend a 3:42 or the 3:55 a good choice for the car.
My last 455 project was in a 63 cat wagon. It would pick up the wheels and run the quarter in high 12's This engine had no special rollercam or enhancments. It ran 71 96's with a ram 3 cam. 4-speed and 3:42 gears. This is pushing a two ton barge down the quarter.

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So, Blacky, what's your biggest turn on? Is it that Big Blue Ball that the Tiger is holding? Rash

[This message has been edited by Blackcat (edited 12-24-2001).]

Tim Corcoran · 12-24-2001, 09:41 PM

Run the 068 cam with 1.65 roller rockers and I agree 3.42 gears for the street. The 3.73's would be noisey, degrade mileage, reduce the life of the motor and wouldn't improve performance at all with that combo. Use the 308 for now and upgrade when you can.

Tim Corcoran

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65 LeMans 11.13@120

Carl · 12-24-2001, 10:38 PM

Go with the Ram Air IV camshaft,Rhoades lfters and a 3:55 gear. You wont be disappointed. Ask Jim Hand about this combo.

Carl · 12-24-2001, 10:43 PM

I use the Ram Air IV cam in my car but it is a 4-speed with 3:55 gears. It is not a dog. I dont use Rhoades lifters either. I use a 800 cfm q-jet and a Performer RPM manifold though.

Goatman · 12-24-2001, 10:50 PM

Jim Hand and quite a few others have used the RAIV cam on stock 455's with absolutely unbelievable results. HO cams are for sissies'. LOL

The car won't be a "dog" by any stretch of the imagination. Its really not an aggressive cam by today's standards whatsoever.

As far as I know, there should be NO reason why you couldn't use hydraulic roller lifters with a hydraulic cam. Its basically the same thing, with a roller at the bottom. However, hydraulic roller lifters are heavier than hydraulic lifters and may negate some performance.

Carl · 12-24-2001, 10:50 PM

I use 1.65 rockers also.

Rholmes · 12-24-2001, 11:51 PM

Goatman that was my thinking,using the RAIV cam with hydraulic roller lifters.I understand I also will have to use the shorter pushrods with lash set the same as ordinary hydraulics(1/2 turn after zero lash).My only concern will the performance be worth the added cost of the rollers.I always use Crane gold 1.65.I purchase my engine rebuild kits from Warrior and they include a choice of cam.I have an older RAIV cam but will probably not use it since it has about 7500 miles on it.I pulled it in favor of a solid single pattern 248 @0.50.Thank everyone for the food for thought.Here in NC(30 mins from the late D. Earnhardt home)Nascar country where chebbys and fords tries to rule,a few of us try to keep Pontiacs respectable.

Goatman · 12-25-2001, 12:59 AM

If you don't already have the roller lifters, I would just get a set of regular hydraulic lifters. I do not feel in that application that they would make a significant difference.

Bigred455 · 12-25-2001, 02:02 AM

i thought the main difference between a 'roller cam' and a 'flat tappet cam' is the ramp on the roller is steepeer to hold the valve open at max lift longer, is that correct?

Half-Inch Stud · 12-25-2001, 10:02 AM

Stop the BS.

Roller Lifters will take the DURATION off of a Flat HYD cam by about 25dergees.

That is why ROLLER CAMS look so RADICAL, yet may have the same or less NET valve Duration then the boring looking Flat HYD cam .

Mechanically, the Roller lifters would survive. You'll get high vacuum, excelent mileage, great 60foots. Motor may choke-off at 3600RPM and higher. Just call the combo "Wheezy"...

Always understand what you're getting into...

H.I. Stud

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