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If you want to improve your ign system, simply use the GM 4 pin HEI module which can be bolted with a heat sink to the side or under the dist. No other 'boxes' reqd. Icing on the cake would be to use an E core ign coil with it, open plug gaps to 0.060". Wiring diagrams/pics on the web. If you...

Run the progressive linkage.

The instruction sheet in post #2 says the -5 will not work with mag triggered dists.

Yup, the 'sealer' is the coating on the gasket.....

mvent, You don't see the advantge of MVA, post #38??? Some engines will detonate if they have 25* [ or more ] fixed timing at idle. They will also make life hard for the starter. Using MVA gives the same timing at idle, but the timing drops off with load & prevents detonation. GM knew what...

Bob, The quoted articles are not my opinion. They are the opinion of others, most of whom are much smarter than you are. The first quote in post #29 is from the two inch thick 1967 Pontiac workshop manual. Does it have to be signed by D. Trump for your approval? With your constant harping...

I ger it, you don't. No Chrys engine ever came from the factory with 21* of initial timing. You have increased your init timing to 21*, which is duplicating what MVA would do. Engine doesn't care how it gets it's timing, as long as it gets it....... So you have realised the benefits..... The...

Bob [ Post #23 ]. How many direct comparisons of MVA v PVA, showing the benefits of MVA, are necessary for a Bob Renton 'expert opinion'. Would four be enough? Some people are slow learners....

What's that saying....... You can lead the horse to the water, but you cannot...

How much $$$$$$$$ ya got to spend???????????? I would NOT buy aftermarket heads & keep the engine size at 383. You will be disappointed for the money spent. Best bang for the buck: buy the 440 crank update kit.

Threewood, Not quite sure what your question is, so I will answer this way. When setting the initial timing, the VA should be disconnected whether using MVA or the useless PVA. So, say you set intial timing at 10* BTDC. Then you connect the VA. If you are using MVA, it will add to the 10*. So if...

The benefit of manifold vacuum is that it improves the idle because at idle it adds timing. Cruising at 2k rpm, would be no difference whether you had MVA or PVA, both would be active. If using MVA, it is most important that the idle vacuum is strong enough to fully the VA unit. Not enough vac...

Many do not realise that with a high rpm performance engine, the destructive force on the rod are not from combustion in the chamber. The greatest load is at the end of the exh stroke where the rod has to arrest/stop the piston at TDC.....& then reverse direction This load can be several tons...

The man vac port on the driver's side is NOT there for the express purpose of a vac source for auto trans that use a vac modulator, although it can be used for the vac mod. Original vac mod cars used a 1/4" fitting; the vac fitting on the carb is 3/16". GM cars used manifold vac adv until 1968 &...

Is this ported or manifold vacuum?

Not cast iron, cast steel. Pontiac V8 rods were all cast steel except for a few higher output engines.

Not only is the stock 3/8" bolt weaker.........but the scallop in the rod shoulder to accomodate the head of the bolt also weakens the rod. Both weak points eliminated with H beam rods....

I owned many Dodge Phoenix's, including this model, for 16 yrs.

Measure the OD of the torsion bars & make sure you have the correct ones.

What model Phoenix?